Anybody know what this is?

T

Tkrocky

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Sep 6, 2013
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That black line in the blade. I thought at first it was just dirt, then I finished it but it didn't sand out or sandblast out. I sharpened it and hammered it through a two by four and antler and it held up great. Haha maybe I figured out how to Hamon 3v! Just kidding but seriously, what the heck is going on


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Yeah both sides. What is that? Does it affect the properties of the steel?


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Alloy banding is when the alloying gets lumped together ( usually as carbides) in a band or stripe. It usually came that way from the factory. In HT if should get re-distributed, but if not it shows up as stripes, blotches, and lines.


3V is a eutectoid steel with only .80% carbon. It has a bunch of chrome and vanadium to make it tough, but these should normally be distributed as free alloying along the grain boundaries, and not locked in carbides.

What was the HT regime and how was it shielded from oxygen? How much was the bevel sanded down after HT? Is the pattern identical on both sides?
 
It was in a foil packet. I heated my oven to 1700, put the knife in and ramped the rest of the way to 1985, then held for 30 minutes. Cryo overnight Then tempered twice at 390. Came out at 61rc exactly like the rest of them. This was all done in a kf27, In the middle of the oven. It was ground to .03 at the edge before heat treat then taken to .01 after


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